import Vue from 'vue';
import Router from 'vue-router';
/* Layout */
import Layout from '@/layout';

Vue.use(Router);

/**
 * Note: sub-menu only appear when route children.length >= 1
 * Detail see: https://panjiachen.github.io/vue-element-admin-site/guide/essentials/router-and-nav.html
 *
 * hidden: true                   if set true, item will not show in the sidebar(default is false)
 * alwaysShow: true               if set true, will always show the root menu
 *                                if not set alwaysShow, when item has more than one children route,
 *                                it will becomes nested mode, otherwise not show the root menu
 * redirect: noRedirect           if set noRedirect will no redirect in the breadcrumb
 * name:'router-name'             the name is used by <keep-alive> (must set!!!)
 * meta : {
    roles: ['admin','editor']    control the page roles (you can set multiple roles)
    title: 'title'               the name show in sidebar and breadcrumb (recommend set)
    icon: 'svg-name'/'el-icon-x' the icon show in the sidebar
    breadcrumb: false            if set false, the item will hidden in breadcrumb(default is true)
    activeMenu: '/example/list'  if set path, the sidebar will highlight the path you set
  }
 */

/**
 * constantRoutes
 * a base page that does not have permission requirements
 * all roles can be accessed
 */
export const constantRoutes = [
  {
    path: '/login',
    component: () => import('@/views/login/index'),
    hidden: true
  },

  {
    path: '/404',
    component: () => import('@/views/404'),
    hidden: true
  },

  {
    path: '/',
    component: Layout,
    redirect: '/dashboard',
    children: [{
      path: 'dashboard',
      name: 'Dashboard',
      component: () => import('@/views/dashboard/index'),
      meta: { title: '首页', icon: 'el-icon-s-home' }
    }]
  },
  {
    path: '/template',
    component: Layout,
    meta: { title: '模板', icon: 'el-icon-news' },
    redirect: '/template/index',
    children: [
      {
        path: 'index',
        name: 'template',
        component: () => import('@/views/template/index'),
        meta: { title: '模板' },
      }
    ]
  },
  {
    path: '/setting',
    component: Layout,
    meta: { title: '系统管理', icon: 'el-icon-s-tools' },
    redirect: '/setting/roleGroup',
    children: [
      {
        path: 'manager',
        name: 'manager',
        component: () => import('@/views/setting/manager/index'),
        meta: { title: '账号管理', menu: "system:account" },
      },
      {
        path: 'roleGroup',
        name: 'roleGroup',
        component: () => import('@/views/setting/roleGroup/index'),
        meta: { title: '权限管理', menu: "system:role" },
      },
      {
        path: 'dict',
        name: 'dict',
        component: () => import('@/views/setting/dict/index'),
        meta: { title: '字典管理' },
      },
      {
        path: 'globalRule',
        name: 'globalRule',
        component: () => import('@/views/setting/globalRule/index'),
        meta: { title: '全局设置', menu: "system:globalRule" },
      }
    ]
  },
  // 404 page must be placed at the end !!!
  { path: '*', redirect: '/404', hidden: true }
];

function hasPermission(menus, route) {
  if (route.meta && route.meta.menu && menus) {
    /*
     * 如果这个路由有menu属性,就需要判断用户是否拥有此menu权限
     */
    return menus.indexOf(route.meta.menu) > -1;
  } else {
    return true;
  }
}

function filterAsyncRoutes(asyncRoutes, menus) {
  return asyncRoutes.filter(route => {
    if (hasPermission(menus, route)) {
      if (route.children && route.children.length) {
        route.children = filterAsyncRoutes(route.children, menus);
        return (route.children && route.children.length);
      }
      return true;
    }
    return false;
  });
}

function createRouter() {
  console.log(constantRoutes);
  let menus = JSON.parse(localStorage.getItem("menus"));
  let accessedRouters = filterAsyncRoutes(constantRoutes, menus);
  return new Router({
    // mode: 'history', // require service support
    scrollBehavior: () => ({
      y: 0
    }),
    routes: accessedRouters,
    routesTemp: accessedRouters,
  });
}


const router = createRouter();

// Detail see: https://github.com/vuejs/vue-router/issues/1234#issuecomment-357941465
export function resetRouter() {
  const newRouter = createRouter();
  router.matcher = newRouter.matcher; // reset router
}

export default router;
